99442921 has 4 divisors (see below), whose sum is σ = 99533700. Its totient is φ = 99352144.

The previous prime is 99442901. The next prime is 99442927. The reversal of 99442921 is 12924499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12924499 = 7 ⋅1846357.

It can be written as a sum of positive squares in 2 ways, for example, as 11289600 + 88153321 = 3360^2 + 9389^2 .

It is a cyclic number.

It is not a de Polignac number, because 99442921 - 2¹³ = 99434729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99442927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43726 + ... + 45943.

It is an arithmetic number, because the mean of its divisors is an integer number (24883425).

Almost surely, 2^99442921 is an apocalyptic number.

It is an amenable number.

99442921 is a deficient number, since it is larger than the sum of its proper divisors (90779).

99442921 is a wasteful number, since it uses less digits than its factorization.

99442921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90778.

The product of its digits is 46656, while the sum is 40.

The square root of 99442921 is about 9972.1071494444. The cubic root of 99442921 is about 463.2953673266.

The spelling of 99442921 in words is "ninety-nine million, four hundred forty-two thousand, nine hundred twenty-one".